私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

當(dāng)前位置:群英聚首 > 論文著作 > 正文
Fe3O4@poly(2-hydroxyethyl methacrylate)-graft-poly(3-caprolactone) magnetic nanoparticles with branched brush polymeric shell
來源:袁偉忠教授個(gè)人網(wǎng)站 發(fā)布日期:2010-07-18
作者:Weizhong Yuan, Jinying Yuan, Lilin Zhou, Sizhu Wu, Xiaoyin Hong
關(guān)鍵字:Superparamagnetic nanoparticles, Brush polymeric shell, Degradation
論文來源:期刊
發(fā)表時(shí)間:2010年

Well-defined monodisperse Fe3O4@poly (2-hydroxyethyl methacrylate)-graft- poly(e-caprolactone) (Fe3O4@PHEMA-g-PCL) magnetic nanoparticles with novel topological structure, i.e., with branched brush polymeric shell, were successfully prepared by the combination of atom transfer radical polymerization (ATRP) and ring-opening polymerization (ROP). Oleic acid stabilized monodisperse Fe3O4
nanoparticles were prepared by a convenient organic phase process and underwent a ligand exchange process with 2-bromo-2-methylpropionic acid (Br-MPA) to generate macroinitiator (Fe3O4@Br-MPA) for ATRP of 2-hydroxyethyl methacrylate (HEMA) to produce Fe3O4@poly(2-hydroxyethyl methacrylate)
(Fe3O4@PHEMA). PCL segments were grafted from the side of PHEMA by the ROP of e-caprolactone (CL) with the hydroxyl groups of PHEMA segments used as initiation centers, and then Fe3O4@PHEMA-g-PCL magnetic nanoparticles were obtained. PCL segments of Fe3O4@PHEMA-g-PCL possessed lower degree of
crystallinity than that of linear PCL. Meanwhile, Fe3O4@PHEMA-g-PCL  anoparticles showed superparamagnetism and comparatively strong magnetization. In vitro degradation investigation indicated that the degradation rate of PCL segments in Fe3O4@PHEMA-g-PCL increased with the decrease of the
length of PCL chains. The release behavior of model drug chlorambucil from the nanoparticles indicated that the rate of drug release could be adjusted by altering the chain-length of PCL segments.

Copyright © 2005 Polymer.cn All rights reserved
中國(guó)聚合物網(wǎng) 版權(quán)所有
經(jīng)營(yíng)性網(wǎng)站備案信息

京公網(wǎng)安備11010502032929號(hào)

工商備案公示信息

京ICP證050801號(hào)

京ICP備12003651號(hào)

主站蜘蛛池模板: 郎溪县| 郑州市| 花莲县| 康马县| 虞城县| 巴青县| 抚松县| 台北县| 黔东| 汶上县| 浠水县| 富顺县| 融水| 清徐县| 启东市| 全椒县| 祁阳县| 景德镇市| 邵阳市| 宜川县| 山丹县| 聂拉木县| 乐都县| 榕江县| 安顺市| 巢湖市| 新乐市| 平顶山市| 乐山市| 鹤峰县| 南昌市| 辉南县| 丰都县| 青岛市| 靖州| 家居| 丰都县| 左权县| 阿勒泰市| 犍为县| 嘉义县|